Parking Brake
This machine is equipped with spring applied parking brakes. The spring force engages the brakes on all four wheels. Hydraulic pressure is used to disengage the brakes. If the hydraulic pressure is unavailable, the brakes will remain engaged.
If hydraulic pressure is unavailable and the machine must be towed, use the 1DE3048 Portable Hydraulic Pump in order to release the parking brake.
Reference: For further information on towing an inoperable machine, consult your AVSpare dealer or refer to Operation and Maintenance Manual, "Towing Information" for the machine that is being serviced.
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Personal injury could result from the sudden stop of the machine. The parking brake is automatically engaged when brake oil pressure drops below an adequate operating pressure. If the brake system oil pressure drops below normal operating pressure, the action alarm will sound. The brake oil pressure indicator and the action lamp will start flashing. If the pressure drops further, the parking brake will engage automatically, the parking brake indicator on the operator's panel will come on and the transmission will shift to neutral. Be prepared for a sudden stop. Correct the reason for the loss of brake oil pressure. Do not move the machine without normal brake oil pressure. |
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| Illustration 1 | g00944602 |
Loss of brake oil pressure will cause the action alarm to sound, action lamp (3) and brake accumulator oil pressure indicator (1) to flash. Further loss of oil pressure will cause parking brake indicator (2) to come on and the parking brake will automatically engage to stop the machine.
Note: If the machine was started with the parking brake control in the OFF position, reset the control by moving it to the ON position and then to the OFF position before the parking brake will disengage.
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The standard parking brake control is a pull-to-engage type. When the knob is pulled OUT, the parking brake will be engaged. Certain mining regulations require machines to be equipped with a push-to-engage parking brake control. When the knob is pushed IN, the parking brake is engaged. Before operating the machine, ensure you are familiar with the operation of the parking brake control. |
Standard Pull-to-Engage Type Parking Brake Control
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| Illustration 2 | g00944605 |
Use the parking brake control to engage or disengage the parking brake when you park the machine. The parking brake control is a push-pull type switch.
| Parking Brake Control - Push parking brake control knob inward to the OFF position in order to disengage the parking brake. Pull the parking brake control knob outward to the ON position in order to engage the parking brake. |
Optional Push-to-Engage Type Parking Brake Control
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| Illustration 3 | g00944605 |
Use the parking brake control to engage or disengage the parking brake when you park the machine. The parking brake control is a push-pull type switch.
| Parking Brake Control - Pull parking brake control knob outward to the OFF position in order to disengage the parking brake. Push the parking brake control knob inward to the ON position in order to engage the parking brake. |
Parking Brake Drive Through
In the case of a hydraulic failure where pressure oil to release the parking brake is not available, a drive through mode is provided. This will allow the machine to be driven through the parking brakes to a safe location.
If a hydraulic or electrical failure occurs, the parking brake may automatically engage. Perform the following procedure to move the machine under these conditions. During this procedure, the monitoring system activates a category three warning.
- Make sure the area is clear of personnel and other machines.
- Move transmission direction and speed control (1) to the FIRST speed forward or FIRST speed reverse position.
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| Illustration 4 | g00944607 |
STIC steering machines | |
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| Illustration 5 | g00944608 |
Wheel steering machines | |
- In a rapid motion, move transmission direction control (1) to the NEUTRAL position and then back to FIRST speed forward or FIRST speed reverse position.
- Increase the engine speed and the machine will drive through the engaged parking brake.
- Steer the machine to a safe location.
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Driving the machine through the parking brakes for an extended period can cause severe damage to the braking system. Inspect the parking brake system and make any necessary repairs before returning the machine to operation. |
Service Brake
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| Illustration 6 | g00944611 |
Service Brake/Transmission Neutralizer Pedal (1) - Use the left brake pedal to disengage the transmission and to slow down the machine's ground speed. This permits higher engine speed for better hydraulic response.
| APPLY - Depress the left brake pedal when truck loading, positioning or when raising the bucket to increase hydraulic speed and reduce unnecessary torque converter stalling. It can also be used to give additional hydraulic power in difficult or particularly tight digging (mucking) conditions. |
| RELEASE - Release the pedal to re-engage the transmission and to release the brake. |
Service Brake Pedal (2) - The right brake pedal slows down the machine ground speed for normal braking.
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| APPLY - Depress the right brake pedal for normal machine braking. |
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| RELEASE - Release the right pedal in order to release the brake. |
If the service brake pedal does not stop the machine, use the parking brake control to stop the machine. When the machine stops, block the wheels. If necessary, make repairs.